Method for the quality control and/or tracking of an injection molded part produced in a production cycle, and plastic industrial facility for this purpose

Abstract

Method for the quality control and/or tracking of an injection molded part produced in a production cycle using at least one processing machine of the plastic processing industry and a plastic processing facility, in which production devices or stations arranged upstream or downstream are connected together via a network. Each individual injection molded part or a specified number of injection molded parts is assigned a quality value composed of multiple quality values in that each device or station in the production chain ascertains or generates its own quality value and extends same by the transmitted values of each previous device or previous station and forwards same as the new quality value to the following device or following station or in that a separate collecting station, in particular a hardware and software, requests the quality values, the device values and/or material values thereof, from the individual devices or stations or is transmitted thereto, and the collecting station puts said the values into correlation.

The invention claimed is: 
     
       1. A method for quality control and/or tracking of an injection molding part produced in a production cycle with at least one processing machine of the plastics-processing industry, and upstream and/or downstream production devices or stations, which include reservoirs or hoppers for a material; granulate dryers; material distributors; conveying devices; metering devices; temperature control units; flow controllers; and at least one of robots, camera systems or measuring devices for quality control, which are interconnected via a network, the method comprising:
 assigning to each individual injection molding part or a specific number of injection molding parts a quality contribution consisting of a plurality of quality contributions from a start of granulate conveying to a finished injection molding part, 
 wherein each of the devices or stations in the production cycle generates a respective one of the plurality of quality contributions, which includes at least one of a device contribution or a material contribution, extends the respective one of the plurality of quality contributions by quality contributions of upstream devices or stations, and forwards the respective quality contribution to a downstream device or station. 
 
     
     
       2. The method according to  claim 1 , wherein in the devices or stations, a material controller is used for management of the material. 
     
     
       3. The method according to  claim 1 , wherein the device contribution of a device is formed by data of the device and with a time stamp. 
     
     
       4. The method according to  claim 1 , wherein the quality contributions of all devices or stations for producing the injection molding part are placed in a temporal sequence. 
     
     
       5. The method according to  claim 4 , wherein, in the preparation of the temporal sequence in the quality contributions, delay times for preparation or processing of the material in the individual devices or stations, respectively, are taken into account when creating the temporal sequence in the quality contributions, wherein the delay times are determined by the individual devices or stations, by a test run, or manually set and stored. 
     
     
       6. The method according to  claim 1 , wherein the material conveyed from the reservoir or hoppers is divided into material units, in the size of the delivery volume of a material loader used, and the quality of the material units is stored in a database or passed from one device to another device. 
     
     
       7. The method according to  claim 6 , wherein the quality of the material units are stored in tables in the database in relation to a device type and are related via IDs (identification codes). 
     
     
       8. The method according to  claim 6 , wherein the quality of the material units is further supplemented by each device involved in processing of the material units. 
     
     
       9. The method according to  claim 1 , wherein an estimated delivery quantity of the material or material unit conveyed in a material loader when passing through devices with dosing functionality or quantity measuring devices is correctable retrospectively by adapting one or more distributed databases/lists with stored delivery quantities or by using a control algorithm. 
     
     
       10. The method according to  claim 9 , wherein the estimated delivery quantities or conveying parameters, respectively, are calculated to result in delivery quantities measured in devices, including injection-molding machines or dosing devices, having measurable delivery quantities. 
     
     
       11. The method according to  claim 1 , wherein data of a device contribution from one of the devices or stations in which the injection molding part is produced and/or from a time at which the injection molding part is taken from a conveyor belt is stored. 
     
     
       12. The method according to  claim 1 , wherein the conveying devices include a conveyor belt, used as a cooling section, that is processed with delay times as one of the devices or stations, so that the quality contribution of the injection molding part at the end of the conveyor belt is detected. 
     
     
       13. The method according to  claim 1 , wherein an exact time of processing of a material unit is recorded and stored by each of the devices or stations. 
     
     
       14. The method according to  claim 1 , wherein the material comprises granules. 
     
     
       15. The method according to  claim 1 , wherein a separate collection station comprises hardware and software for Chain of Quality (COQ).